vocatio legis is incorrectly written and should be written as "Vacatio legis" being its meaning: Legal Latinism which literally means empty legal exemption or dispensation from the law. Actually, it is the period between the publication of a law and its entry into force. This period varies according to each country if its entry into force is not specified in the law itself. In Spain, this period is 20 days. In the ecclesiastical laws are three months.